ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 51, (2) 74 - 81 (2007)

Janotka Ivan 1, Krajči Ľudovít 1, Mojumdar Subhash C. 2
1 Institute of Construction and Architecture, Slovak Academy of Sciences, Dúbravská cesta 9, 845 03 Bratislava, Slovakia
2 Faculty of Forestry, University of Toronto, 33 Willcocks Street, Toronto, Ontario, M5S 3B3, Canada

Keywords: Blended cement, Mortar, Hydration, Sulphoaluminate-belite cement

Sulphoaluminate - belite (SAB) cements are an attractive class of low energy cements from the viewpoint of energy saving and less CO₂ releasing into the atmosphere during their production. Their hydraulic activity, however, does not match that of the Ordinary Portland cement (PC) and needs improvement before they can be used on their own. Performance of SAB cement with 50.3 wt. % of C₂S, 20.2 wt. % of C₄A₃S̅, 19.5 wt. % of C₄AF and 9.7 wt. % of CS̅ has been compared with that of PC having 67.6 wt. % of C₃S, 5.1 wt. % of C₂S, 9.2 wt. % of C₃A, 10.6 wt. % of C₄AF and 5.9 wt. % of CS̅, and blast-furnace slag Portland cement (BFSPC) containing 30 wt. % of blast-furnace slag. Mortars with the above cements and siliceous sand with the weight ratio of 1 : 3 and water to cement ratio of 0.5 were manufactured and 40×40×160-mm prisms were stored at 20 °C for 90 days under 100% R.H. - wet air conditions. The physical-mechanical properties (strengths, dynamic modulus of elasticity), shrinkage reducing properties and passivation ability of SAB cement approach to those of BFSPC. With further improvement in the SAB cement quality through better understanding of their characteristics, a genuine competition between SAB cement and BFSPC can be expected in practice.

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